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采用滴涂法制备了单壁碳纳米管修饰的纳米碳纤维电极,研究了多巴胺(DA)、抗坏血酸(AA)及其混合溶液在修饰前后电极上的电化学行为。在20 mmol/L Tris-HCl(pH 7.4)缓冲溶液中,修饰电极对DA和AA具有很好的电催化作用。采用差示脉冲伏安法对DA与AA混合溶液氧化峰电流与浓度的关系进行定量分析,DA和AA的氧化峰电流在1.0×10-7~5.0×10-5mol/L和1.0×10-5~1.0×10-3mol/L范围内与浓度呈线性关系,其线性回归方程及相关系数分别为Ip=0.0012c+4×10-9,r=0.9907;Ip=10-5c+7×10-10,r=0.9974,两种物质的检测限分别达到8.0×10-9mol/L和2×10-6mol/L。
Single-walled carbon nanotubes (CNTs) modified carbon nanofibers were prepared by a drop-coating method. The electrochemical behavior of dopamine (DA), ascorbic acid (AA) In 20 mmol / L Tris-HCl (pH 7.4) buffer solution, the modified electrode has good electrocatalytic activity for DA and AA. The relationship between oxidation peak current and concentration of DA and AA mixed solution was quantitatively analyzed by differential pulse voltammetry. The oxidation peak currents of DA and AA were 1.0 × 10-7 ~ 5.0 × 10-5mol / L and 1.0 × 10- 5-1.0 × 10-3mol / L, the linear regression equation and the correlation coefficients were Ip = 0.0012c + 4 × 10-9, r = 0.9907, Ip = 10-5c + 7 × 10 -10, r = 0.9974. The detection limits of the two substances reached 8.0 × 10-9mol / L and 2 × 10-6mol / L, respectively.